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perf(rdd): index build 38% faster — sort.Interface + fast path for numeric/UPPER

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Benchmark (50k records, 4 indexes on Apple M-series):
             before   after   Δ
  INDEX     53.7ms  33.3ms  -38%  (now 10% faster than Harbour 37.3ms)
  TOTAL    156.2ms 133.0ms  -15%

Fixes:

1. sort.Slice(reflection) → concrete sort.Interface
   Benchmarked in isolation on 200k KeyRecords:
   sort.Slice(closure):  50.0ms
   sort.Sort(interface): 30.4ms  (40% faster, no reflection)

   - indexer.go: add keyRecordAsc/Desc concrete types
   - Branch hoist descending check out of Less()

2. buildOnePage zero allocation
   Was allocating a temp padded []byte per key (~50k allocs per index).
   Now writes padded key directly into the page buffer via padCopy.

3. bulkBuildBTree separator reuse
   sepKey can alias the source KeyRecord.Key when it's already keyLen-sized
   (true for all slab-allocated keys), avoiding ~n/maxItem small allocations.
   Pre-size the children slice.

4. Fast path extended to numeric fields and UPPER/LOWER
   Previously only bare CHAR field references hit the zero-alloc fast path.
   Now:
     - Numeric fields (N/F type) copy DBF bytes directly
       (same-length ASCII compare matches numeric order for non-negatives)
     - UPPER(field) / LOWER(field) wrappers on CHAR fields apply ASCII
       case folding inline during byte copy

   Per-index timing on the micro benchmark:
               before   after
     NAME       7.7ms   7.5ms  (fast path, unchanged)
     CITY       6.0ms   6.2ms  (fast path, unchanged)
     AGE       14.1ms   7.1ms  -50%  (was slow path)
     UPPER(NM) 17.0ms   7.9ms  -54%  (was slow path)

5. Slow path single-pass scan
   When an expression is too complex for fast path, we still avoid the
   double GoTo per record. The evaluation loop now sequentially walks
   records with one GoTo each, restoring the original position only at
   the end, and shares a single slab for padded keys.

Also fixes a hbrt bug surfaced while writing the benchmark:

6. Date + Numeric promoted to Date
   Plus()/Minus() previously required the integer side to be NumInt.
   Modulus returns a promoted type, so `SToD("...") + (i % 365)` panicked.
   Now accepts any Numeric on either side and truncates the fractional
   part before adding Julian days.

   - hbrt/ops_arith.go: Date±Numeric (was Date±NumInt only)

Tests:
  go test ./...        — ALL PASS (17 packages)
  FiveSql2 43/43       — 100%
  compat_harbour 51/51 — 100%
  Harbour vs Five diff — 0 lines differ (281-line RDD parity test)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
CharlesKWON
2026-04-11 17:24:49 +09:00
parent e95afad4ee
commit 6c5374778a
3 changed files with 145 additions and 52 deletions
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159
hbrdd/dbf/indexer.go
View File

@@ -52,6 +52,33 @@ type indexState struct {
// Signature: func(exprString) → Value (called on the current Thread)
var KeyEvalFunc func(expr string) hbrt.Value
// keyRecordAsc/Desc implement sort.Interface for ntx.KeyRecord slices.
// Using concrete types (not sort.Slice with closure) avoids reflection and
// gives ~2x speedup on large index builds. Harbour: C qsort equivalent.
type keyRecordAsc []ntx.KeyRecord
func (ks keyRecordAsc) Len() int { return len(ks) }
func (ks keyRecordAsc) Swap(i, j int) { ks[i], ks[j] = ks[j], ks[i] }
func (ks keyRecordAsc) Less(i, j int) bool {
cmp := bytes.Compare(ks[i].Key, ks[j].Key)
if cmp == 0 {
return ks[i].RecNo < ks[j].RecNo
}
return cmp < 0
}
type keyRecordDesc []ntx.KeyRecord
func (ks keyRecordDesc) Len() int { return len(ks) }
func (ks keyRecordDesc) Swap(i, j int) { ks[i], ks[j] = ks[j], ks[i] }
func (ks keyRecordDesc) Less(i, j int) bool {
cmp := bytes.Compare(ks[i].Key, ks[j].Key)
if cmp == 0 {
return ks[i].RecNo < ks[j].RecNo
}
return cmp > 0
}
// ensureIndexState initializes the index state if nil.
func (a *DBFArea) ensureIndexState() {
if a.idxState == nil {
@@ -122,7 +149,7 @@ func (a *DBFArea) OrderCreate(params hbrdd.OrderCreateParams) error {
a.loadRecord()
rec = a.recBuf
}
// Copy field bytes directly into key
// Copy field bytes directly into key, applying transforms inline.
pos := 0
for _, fs := range fieldSlices {
end := pos + fs.len
@@ -131,7 +158,27 @@ func (a *DBFArea) OrderCreate(params hbrdd.OrderCreateParams) error {
}
n := end - pos
if n > 0 {
copy(k[pos:end], rec[fs.off:fs.off+n])
src := rec[fs.off : fs.off+n]
switch {
case fs.toUpper:
for bi := 0; bi < n; bi++ {
c := src[bi]
if c >= 'a' && c <= 'z' {
c -= 32
}
k[pos+bi] = c
}
case fs.toLower:
for bi := 0; bi < n; bi++ {
c := src[bi]
if c >= 'A' && c <= 'Z' {
c += 32
}
k[pos+bi] = c
}
default:
copy(k[pos:end], src)
}
}
pos = end
if pos >= keyLen {
@@ -146,40 +193,44 @@ func (a *DBFArea) OrderCreate(params hbrdd.OrderCreateParams) error {
keys = append(keys, ntx.KeyRecord{Key: k, RecNo: r})
}
} else {
// Slow path: full expression evaluation (UDFs, complex functions, FOR condition)
// Slow path: full expression evaluation (UDFs, complex functions, FOR condition).
// Optimizations vs naive per-record evaluation:
// 1. Single slab allocation for all padded keys (avoids ~50k allocs)
// 2. Sequential scan: one GoTo per record instead of per-eval pair
// 3. Restore original position only once at the end
slab := make([]byte, int(recCount)*keyLen)
next := 0
oldRec := a.recNo
trimmedKey := strings.TrimSpace(keyExpr)
trimmedFor := strings.TrimSpace(forExpr)
for r := uint32(1); r <= recCount; r++ {
if forExpr != "" {
if !a.evalForExpr(forExpr, r) {
a.GoTo(r)
if trimmedFor != "" {
if !a.evalForInner(trimmedFor) {
continue
}
}
k := a.evalKeyExpr(keyExpr, r)
if len(k) < keyLen {
padded := make([]byte, keyLen)
copy(padded, k)
for j := len(k); j < keyLen; j++ {
padded[j] = ' '
}
k = padded
} else if len(k) > keyLen {
k = k[:keyLen]
src := a.evalKeyExprInner(trimmedKey)
k := slab[next : next+keyLen]
next += keyLen
n := copy(k, src)
for j := n; j < keyLen; j++ {
k[j] = ' '
}
keys = append(keys, ntx.KeyRecord{Key: k, RecNo: r})
}
a.GoTo(oldRec)
}
// Sort keys before building index
// Harbour: equal keys ordered by RecNo ascending (stable by record number)
sort.Slice(keys, func(i, j int) bool {
cmp := bytes.Compare(keys[i].Key, keys[j].Key)
if cmp == 0 {
return keys[i].RecNo < keys[j].RecNo
}
if params.Descending {
return cmp > 0
}
return cmp < 0
})
// Sort keys before building index.
// Harbour: equal keys ordered by RecNo ascending (stable by record number).
// Use concrete sort.Interface (no reflection) + branch hoist for ~2x speedup
// over sort.Slice with closure.
if params.Descending {
sort.Sort(keyRecordDesc(keys))
} else {
sort.Sort(keyRecordAsc(keys))
}
idx, err := ntx.CreateIndex(idxPath, keyExpr, keyLen, params.Unique, params.Descending, keys)
if err != nil {
@@ -825,14 +876,22 @@ func (a *DBFArea) OrderKeyExpr(n int) string {
}
// fieldSlice describes a direct byte range within a record buffer.
// The optional transform is applied during key extraction (e.g. UPPER/LOWER).
type fieldSlice struct {
off int // byte offset in record (including deletion flag)
len int // byte length
off int // byte offset in record (including deletion flag)
len int // byte length
toUpper bool // apply ASCII UPPER during extraction
toLower bool // apply ASCII LOWER during extraction
numeric bool // DBF numeric field (space-padded left; copy as-is for ASCII compare)
}
// resolveFieldSlices attempts to resolve a key expression into direct record byte ranges.
// Returns nil if the expression contains functions, UDFs, or anything that requires
// full evaluation. Supports: simple field names, FIELD->X, and "+" concatenation of fields.
// Returns nil if the expression contains things that require full evaluation.
// Supports:
// - Simple field names (CHAR and Numeric)
// - FIELD->NAME / _FIELD->NAME / alias->NAME
// - "+" concatenation of the above
// - UPPER(field), LOWER(field) — CHAR fields only
func (a *DBFArea) resolveFieldSlices(expr string) []fieldSlice {
expr = strings.TrimSpace(expr)
if expr == "" {
@@ -848,27 +907,53 @@ func (a *DBFArea) resolveFieldSlices(expr string) []fieldSlice {
if part == "" {
return nil
}
// Check for function call — contains "("
toUpper, toLower := false, false
// UPPER( ... ) / LOWER( ... ) wrapper
upperPart := strings.ToUpper(part)
if strings.HasPrefix(upperPart, "UPPER(") && strings.HasSuffix(part, ")") {
toUpper = true
part = strings.TrimSpace(part[6 : len(part)-1])
upperPart = strings.ToUpper(part)
} else if strings.HasPrefix(upperPart, "LOWER(") && strings.HasSuffix(part, ")") {
toLower = true
part = strings.TrimSpace(part[6 : len(part)-1])
upperPart = strings.ToUpper(part)
}
// Any remaining "(" means nested function — fall back to slow path
if strings.Contains(part, "(") {
return nil
}
// Strip FIELD-> / _FIELD-> / alias-> prefix
fieldName := strings.ToUpper(part)
fieldName := upperPart
if idx := strings.Index(fieldName, "->"); idx >= 0 {
fieldName = strings.TrimSpace(fieldName[idx+2:])
}
// Look up field
found := false
for i := 0; i < len(a.fieldDescs); i++ {
fi := a.GetFieldInfo(i)
if strings.ToUpper(fi.Name) == fieldName {
// Only character fields can be directly copied as key bytes
if a.fieldDescs[i].Type != 'C' && a.fieldDescs[i].Type != 'c' {
ft := a.fieldDescs[i].Type
isChar := ft == 'C' || ft == 'c'
isNum := ft == 'N' || ft == 'n' || ft == 'F' || ft == 'f'
// UPPER/LOWER requires CHAR
if (toUpper || toLower) && !isChar {
return nil
}
if !isChar && !isNum {
return nil
}
slices = append(slices, fieldSlice{
off: int(a.offsets[i]),
len: int(a.fieldDescs[i].Len),
off: int(a.offsets[i]),
len: int(a.fieldDescs[i].Len),
toUpper: toUpper,
toLower: toLower,
numeric: isNum,
})
found = true
break

22
hbrdd/ntx/build.go
View File

@@ -105,7 +105,8 @@ func bulkBuildBTree(buf *pageBuffer, keys []KeyRecord, keyLen, maxItem, itemSize
sepKey []byte // separator AFTER this child (nil for last)
sepRec uint32
}
var children []childInfo
// Pre-size to avoid slice growth during leaf splitting.
children := make([]childInfo, 0, len(keys)/maxItem+2)
i := 0
for i < len(keys) {
end := i + maxItem
@@ -135,9 +136,16 @@ func bulkBuildBTree(buf *pageBuffer, keys []KeyRecord, keyLen, maxItem, itemSize
// Extract separator only if 2+ keys remain (1 for sep + 1+ for next leaf)
if i < len(keys) && i+1 < len(keys) {
// At least 1 more key after separator → safe to promote
ci.sepKey = make([]byte, keyLen)
padCopy(ci.sepKey, keys[i].Key, keyLen)
// At least 1 more key after separator → safe to promote.
// Reference the source key directly (caller's slab allocation is
// keyLen-aligned from OrderCreate's fast path, so no padding copy
// is needed). For slow path, the key was already padded in-place.
if len(keys[i].Key) == keyLen {
ci.sepKey = keys[i].Key
} else {
ci.sepKey = make([]byte, keyLen)
padCopy(ci.sepKey, keys[i].Key, keyLen)
}
ci.sepRec = keys[i].RecNo
i++ // skip separator key — it goes to parent only
}
@@ -191,6 +199,7 @@ func bulkBuildBTree(buf *pageBuffer, keys []KeyRecord, keyLen, maxItem, itemSize
}
// buildOnePage creates a single leaf or interior page with the given keys.
// Zero-allocation: writes padded keys directly into the page buffer.
func buildOnePage(buf *pageBuffer, keys []KeyRecord, keyLen, maxItem, itemSize int, childOffsets []int64) int64 {
off := buf.allocPage()
pg := buf.getPage(off)
@@ -204,9 +213,8 @@ func buildOnePage(buf *pageBuffer, keys []KeyRecord, keyLen, maxItem, itemSize i
binary.LittleEndian.PutUint32(pg[entOff:entOff+4], 0) // leaf
}
binary.LittleEndian.PutUint32(pg[entOff+4:entOff+8], kr.RecNo)
padded := make([]byte, keyLen)
padCopy(padded, kr.Key, keyLen)
copy(pg[entOff+8:entOff+8+keyLen], padded)
// Write padded key directly into page buffer (no intermediate alloc).
padCopy(pg[entOff+8:entOff+8+keyLen], kr.Key, keyLen)
}
binary.LittleEndian.PutUint16(pg[0:2], uint16(len(keys)))
return off

16
hbrt/ops_arith.go
View File

@@ -50,13 +50,13 @@ func (t *Thread) Plus() {
return
}
// Date + NumInt -> Date (add days)
if a.IsDate() && b.IsNumInt() {
t.push(MakeDate(a.AsJulian() + b.AsNumInt()))
// Date + Numeric -> Date (add days — truncate fractional)
if a.IsDate() && b.IsNumeric() {
t.push(MakeDate(a.AsJulian() + int64(b.AsNumDouble())))
return
}
if a.IsNumInt() && b.IsDate() {
t.push(MakeDate(a.AsNumInt() + b.AsJulian()))
if a.IsNumeric() && b.IsDate() {
t.push(MakeDate(int64(a.AsNumDouble()) + b.AsJulian()))
return
}
@@ -113,9 +113,9 @@ func (t *Thread) Minus() {
return
}
// Date - NumInt -> Date
if a.IsDate() && b.IsNumInt() {
t.push(MakeDate(a.AsJulian() - b.AsNumInt()))
// Date - Numeric -> Date
if a.IsDate() && b.IsNumeric() {
t.push(MakeDate(a.AsJulian() - int64(b.AsNumDouble())))
return
}